Results 61 to 70 of about 105 (77)

Study on methods for regional geomagnetic field modeling to detect tectonomagnetic signals

Study on methods for regional geomagnetic field modeling to detect tectonomagnetic signals
openaire  

Some of the next articles are maybe not open access.

Related searches:

Tectonomagnetic anomaly during the southern California downwarp

Journal of Geophysical Research: Solid Earth, 1979
Resurveys of the local geomagnetic field in southern California, using magnetometers in a differential mode, indicate the development of an anomalous field of more than 10 γ that appears to correspond to the partial collapse of the southern California uplift.
M. J. S. Johnston, F. J. Williams, J. McWhirter, B. E. Williams   +3 more
openaire   +1 more source

Investigations of tectonomagnetic phenomena in China

Physics of the Earth and Planetary Interiors, 1989
Abstract The Tangshan earthquake ( M = 7.8, 28 July 1976) occurred in North China, where there is relatively dense network of geomagnetic observations. Before the earthquake there were anomalies of ∼ 8–10 nT in the total intensity of the geomagnetic field at Ninghe and Dongtietou sites, 50–90 km from the epicenter, and also in the Beijing survey ...
openaire   +1 more source

Application of tectonomagnetism to earthquake phenomena

Tectonophysics, 1972
Abstract The magnetization (J) of a rock compressed uniaxially by σ whose axis makes an angle θ with the direction of J is proved experimentally and theoretically to be presented by J(θ,σ) = Jo[1− (βσ 4) × (3 cos2θ + 1)] , where Jo denotes the magnetization of the uncompressed rock. Similarly, the magnetization of a rock under a uniaxial tension
openaire   +1 more source

Tectonomagnetic field observations in central Italy 1989–1995

Physics of the Earth and Planetary Interiors, 1998
Abstract It has been reported that earthquakes and volcanic eruptions produce significant variations in the geomagnetic field. To investigate possible tectonomagnetic effects related to seismic activity, the Istituto Nazionale di Geofisica installed a seismomagnetic network in central Italy; the area was selected after a magnetic noise survey ...
Antonio Meloni, Giuliana Mele, Paolo Palangio   +2 more
openaire   +1 more source

Reducing noise in tectonomagnetic experiments by linear regression

Journal of Geophysical Research: Solid Earth, 1979
Noise in tectonomagnetic experiments caused by geomagnetic variations due to nonlocal sources can be reduced by applying multivariate linear regression to data from a network of magnetometer sites. Residuals obtained by subtracting from the observed values at a particular site the values calculated from a regression expression using the simultaneous ...
openaire   +1 more source

Tectonomagnetic event detection using empirical transfer functions

Journal of Geophysical Research: Solid Earth, 1978
We have devised a method of analyzing geomagnetic array data which effectively filters out variations caused by atmospheric disturbances, their associated ground currents, and local variations in magnetic susceptibility. This method has application to the detection of tectonomagnetic variations.
Kenneth A. Poehls, David D. Jackson
openaire   +1 more source

Detection of tectonomagnetic events using multichannel predictive filtering

Journal of Geophysical Research: Solid Earth, 1981
High‐precision geomagnetic measurement depends on eliminating variations of ionospheric and magnetospheric origin. The commonly used technique of simply taking differences between total field magnetometers is only partially successful. Our method involves finding the multichannel Wiener filters which predict the field variation at a given total field ...
P. M. Davis, D. D. Jackson, C. A. Searls, R. L. McPherron   +3 more
openaire   +1 more source

Improved signal discrimination in tectonomagnetism: Discovery of a volcanomagnetic effect at Kilauea, Hawaii

Physics of the Earth and Planetary Interiors, 1979
Cancellation of extraterrestrial magnetic disturbances by taking simple differences between total field readings at spaced stations is imperfect. It is shown that improvement is possible when three component observatory data are available from a single station in the general, but not necessarily immediate, vicinity of an array of total field stations ...
Davis, P. M., Stacey, F. D., Zablocki, C. J., Olson, J. V.   +3 more
openaire   +3 more sources

A tectonomagnetic effect observed before a magnitude 5.2 earthquake near Hollister, California

Journal of Geophysical Research, 1976
Simultaneous measurements of geomagnetic field with an array of seven proton precession magnetometers along the San Andreas fault show that the most significant local changes during 1974 were recorded at a site 11 km from a magnitude 5.2 earthquake that occurred on November 28, 1974.
B. E. Smith, M. J. S. Johnston
openaire   +1 more source